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-.TH STRING 3
-.CT 2 data_man
-.SH NAME
-strcat, strncat, strcmp, strncmp, strcpy, strncpy, strlen,
-strchr, strrchr, strpbrk, strspn, strcspn, strtok, strdup \(mi string operations
-.SH SYNOPSIS
-.nf
-.2C
-.B #include <libc.h>
-.PP
-.B char *strcat(s1, s2)
-.B char *s1, *s2;
-.PP
-.B char *strncat(s1, s2, n)
-.B char *s1, *s2;
-.B int n;
-.PP
-.B int strcmp(s1, s2)
-.B char *s1, *s2;
-.PP
-.B int strncmp(s1, s2, n)
-.B char *s1, *s2;
-.B int n;
-.PP
-.B char *strcpy(s1, s2)
-.B char *s1, *s2;
-.PP
-.B char *strncpy(s1, s2, n)
-.B char *s1, *s2;
-.B int n;
-.PP
-.B int strlen(s)
-.B char *s;
-.PP
-.B char *strchr(s, c)
-.B char *s;
-.B int c;
-.PP
-.B char *strrchr(s, c)
-.B char *s;
-.B int c;
-.PP
-.B char *strpbrk(s1, s2)
-.B char *s1, *s2;
-.PP
-.B int strspn(s1, s2)
-.B char *s1, *s2;
-.PP
-.B int strcspn(s1, s2)
-.B char *s1, *s2;
-.PP
-.B char *strtok(s1, s2)
-.B char *s1, *s2;
-.PP
-.B char *strdup(s)
-.B char *s;
-.sp
-.1C
-.SH DESCRIPTION
-The arguments
-.I s1, s2
-and
-.I s
-point to null-terminated strings.
-The functions
-.IR strcat ,
-.IR strncat ,
-.IR strcpy ,
-and
-.I strncpy
-all alter
-.IR s1 .
-These functions do not check for overflow of
-the array pointed to by
-.IR s1 .
-.PP
-.I Strcat
-appends a copy of string
-.I s2
-to the end of string
-.IR s1 .
-.I Strncat
-appends at most
-.I n
-characters.
-Each returns a pointer to the null-terminated result.
-.PP
-.I Strcmp
-compares its arguments and returns an integer
-less than, equal to, or greater than 0,
-according as
-.I s1
-is lexicographically less than, equal to, or
-greater than
-.IR s2 .
-.I Strncmp
-makes the same comparison but looks at at most
-.I n
-characters.
-.PP
-.I Strcpy
-copies string
-.I s2
-to
-.IR s1 ,
-stopping after the null character has been copied.
-.I Strncpy
-copies exactly
-.I n
-characters,
-truncating
-.I s2
-or adding
-null characters to
-.I s1
-if necessary.
-The result will not be null-terminated if the length
-of
-.I s2
-is
-.I n
-or more.
-Each function returns
-.IR s1 .
-.PP
-.I Strlen
-returns the number of characters in
-.IR s ,
-not including the terminating null character.
-.PP
-.I Strchr
-.RI ( strrchr )
-returns a pointer to the first (last)
-occurrence of character
-.I c
-in string
-.IR s ,
-or
-.L (char *)0
-if
-.I c
-does not occur in the string.
-The null character terminating a string is considered to
-be part of the string.
-.PP
-.I Strpbrk
-returns a pointer to the first occurrence in string
-.I s1
-of any character from string
-.IR s2 ,
-.L (char *)0
-if no character from
-.I s2
-exists in
-.IR s1 .
-.PP
-.I Strspn
-.RI ( strcspn )
-returns the length of the initial segment of string
-.I s1
-which consists entirely of characters from (not from) string
-.IR s2 .
-.PP
-.I Strtok
-considers the string
-.I s1
-to consist of a sequence of zero or more text tokens separated
-by spans of one or more characters from the separator string
-.IR s2 .
-The first call, with pointer
-.I s1
-specified, returns a pointer to the first character of the first
-token, having replaced the character after the token by 0.
-Subsequent calls,
-signified by
-.I s1
-being
-.LR "(char *)0" ,
-will scan from where the preceding call left off.
-The separator string
-.I s2
-may be different from call to call.
-When no token remains in
-.IR s1 ,
-.L (char *)0
-is returned.
-.PP
-.I Strdup
-returns a pointer to a distinct copy of the null-terminated string
-.I s
-in space obtained from
-.IR malloc (3)
-or
-.L (char *)0
-if no space can be obtained.
-.SH SEE ALSO
-.IR memory (3)
-.SH BUGS
-.I Strcmp
-and
-.I strncmp
-use native character comparison, which may
-be signed or unsigned.
-.br
-The outcome of overlapping moves varies among implementations.